I didn't add any new features except for the wall too. Here is how it works:
1) Select some scenery
2) Rotate it to a suitable "wall" position
3) Check the wall tickbox
4) Drag it around to create a wall =D

This took me 1 minute to create (This building is HUGE):
This took me about 20 seconds:

i havent checked yet, but can you fix the demo campaign loading thing.? yno, where you have to demo hack them? also wasnt it the left button? whatever lol uhh, did you read my manual/slide post for the last proof of concept one? also machines please.